This photo was taken about five minutes after the incident I described. We raced ahead of where he was walking and I directed the driver to a perfect broadside shot lined up with most intense part of sunset. There were a variety of reasons those photos (while he was so close walking toward me) didn't turn out--other safari vehicles in background, sunset not lined up properly, too wide-angle without enough telephoto, etc--though it would not surprise me to learn that shaking hands was another factor!